--- CMakeLists.txt.old	2014-08-04 15:26:19.636569061 +0200
+++ CMakeLists.txt	2014-08-04 15:26:54.637618456 +0200
@@ -77,7 +77,7 @@
 pkg_check_modules(IBUS REQUIRED ibus-1.0>=1.3.7)
 
 # check doxygen
-find_package(Doxygen REQUIRED)
+find_package(Doxygen)
 
 # =====
 # Define variables